<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    package org.hackystat.telemetry.analyzer.evaluator;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.util.TreeMap;<a name="line.3"></a>
<FONT color="green">004</FONT>    <a name="line.4"></a>
<FONT color="green">005</FONT>    import org.hackystat.telemetry.analyzer.language.ast.Constant;<a name="line.5"></a>
<FONT color="green">006</FONT>    import org.hackystat.telemetry.analyzer.language.ast.Variable;<a name="line.6"></a>
<FONT color="green">007</FONT>    <a name="line.7"></a>
<FONT color="green">008</FONT>    /**<a name="line.8"></a>
<FONT color="green">009</FONT>     * Variable resolver. It maps &lt;code&gt;Variable&lt;/code&gt;s to &lt;code&gt;Constant&lt;/code&gt;s.<a name="line.9"></a>
<FONT color="green">010</FONT>     * <a name="line.10"></a>
<FONT color="green">011</FONT>     * @author (Cedric) Qin ZHANG<a name="line.11"></a>
<FONT color="green">012</FONT>     */<a name="line.12"></a>
<FONT color="green">013</FONT>    public class VariableResolver {<a name="line.13"></a>
<FONT color="green">014</FONT>    <a name="line.14"></a>
<FONT color="green">015</FONT>      /** Key is variable name, value is instance of Constant. */<a name="line.15"></a>
<FONT color="green">016</FONT>      private TreeMap&lt;String, Constant&gt; map = new TreeMap&lt;String, Constant&gt;();<a name="line.16"></a>
<FONT color="green">017</FONT>      <a name="line.17"></a>
<FONT color="green">018</FONT>      /**<a name="line.18"></a>
<FONT color="green">019</FONT>       * Adds a variable-constant pair so that later the variable can be resolved.<a name="line.19"></a>
<FONT color="green">020</FONT>       * <a name="line.20"></a>
<FONT color="green">021</FONT>       * @param variable The variable.<a name="line.21"></a>
<FONT color="green">022</FONT>       * @param constant The constant.<a name="line.22"></a>
<FONT color="green">023</FONT>       * @throws TelemetryEvaluationException If a variable with the same name has already been added.<a name="line.23"></a>
<FONT color="green">024</FONT>       */<a name="line.24"></a>
<FONT color="green">025</FONT>      public void add(Variable variable, Constant constant) throws TelemetryEvaluationException {<a name="line.25"></a>
<FONT color="green">026</FONT>        String varName = variable.getName();<a name="line.26"></a>
<FONT color="green">027</FONT>        if (this.map.containsKey(varName)) {<a name="line.27"></a>
<FONT color="green">028</FONT>          throw new TelemetryEvaluationException("Variable " + varName + " already added.");<a name="line.28"></a>
<FONT color="green">029</FONT>        }<a name="line.29"></a>
<FONT color="green">030</FONT>        this.map.put(varName, constant);<a name="line.30"></a>
<FONT color="green">031</FONT>      }<a name="line.31"></a>
<FONT color="green">032</FONT>      <a name="line.32"></a>
<FONT color="green">033</FONT>      /**<a name="line.33"></a>
<FONT color="green">034</FONT>       * Resolves a variable to a constant.<a name="line.34"></a>
<FONT color="green">035</FONT>       * <a name="line.35"></a>
<FONT color="green">036</FONT>       * @param variable The variable to be resolved.<a name="line.36"></a>
<FONT color="green">037</FONT>       * @return The constant the variable resolves to.<a name="line.37"></a>
<FONT color="green">038</FONT>       * @throws TelemetryEvaluationException If the variable cannot be resolved to a constant.<a name="line.38"></a>
<FONT color="green">039</FONT>       */<a name="line.39"></a>
<FONT color="green">040</FONT>      public Constant resolve(Variable variable) throws TelemetryEvaluationException {<a name="line.40"></a>
<FONT color="green">041</FONT>        String varName = variable.getName();<a name="line.41"></a>
<FONT color="green">042</FONT>        if (! this.map.containsKey(varName)) {<a name="line.42"></a>
<FONT color="green">043</FONT>          throw new TelemetryEvaluationException("Variable " + varName + " not found.");<a name="line.43"></a>
<FONT color="green">044</FONT>        }<a name="line.44"></a>
<FONT color="green">045</FONT>        return this.map.get(varName);<a name="line.45"></a>
<FONT color="green">046</FONT>      }<a name="line.46"></a>
<FONT color="green">047</FONT>    }<a name="line.47"></a>




























































</PRE>
</BODY>
</HTML>
